/**
 * Safari/Firefox-compatible BVH closest point implementation for point clouds with direction output.
 *
 * Extended version of bvhClosestPointToPoints.js that returns both distance
 * and direction to the closest point for use in constraint systems.
 *
 * Returns vec4(distance, directionX, directionY, directionZ) where direction
 * points FROM the closest surface point TOWARD the query point (outward normal).
 */
import type { NodeBuilder } from 'three/webgpu';
import type { TSLFloatNode, TSLFunction, TSLStorageNode, TSLVec3Node, TSLVec4Node } from '../../types/tsl.js';
export interface DirectionDistanceSqToBoundsParameters {
    point: TSLVec3Node;
    boundsMin: TSLVec3Node;
    boundsMax: TSLVec3Node;
}
export interface DirectionDistanceSqToBoundsWGSLFunction {
    (parameters: DirectionDistanceSqToBoundsParameters): TSLFloatNode;
    build(builder: NodeBuilder): void;
}
export type PointsBVHClosestPointWithDirectionArguments = [
    point: TSLVec3Node,
    maxDistance: TSLFloatNode
];
export type PointsBVHClosestPointWithDirectionFunction = TSLFunction<PointsBVHClosestPointWithDirectionArguments, TSLVec4Node>;
/**
 * Computes the squared distance from a point to an AABB.
 */
export declare const distanceSqToBoundsWGSL: DirectionDistanceSqToBoundsWGSLFunction;
/**
 * Creates a PointsBVH closest point function that returns distance AND direction.
 *
 * This extended version is designed for constraint systems where you need
 * both the penetration depth and the push direction.
 *
 * For point clouds, the "normal" is computed as the direction from the
 * closest point to the query point (normalized).
 *
 * Uses the TSL Fn() pattern which:
 * 1. Accesses storage buffers via .element() - generates NodeBuffer_XXX.value[i] syntax
 * 2. Avoids ptr<storage, ...> in function signatures
 * 3. Works on Safari/Firefox WebGPU
 *
 * @param {StorageBufferNode} bvhIndexBuffer - Storage buffer for point indices (uint)
 * @param {StorageBufferNode} bvhPositionBuffer - Storage buffer for point positions (vec3f)
 * @param {StorageBufferNode} bvhNodeBuffer - Storage buffer for BVH nodes (flat f32 array)
 * @returns {Function} A TSL function that computes closest point with direction
 */
export declare function createPointsBVHClosestPointWithDirectionFn(bvhIndexBuffer: TSLStorageNode<'uint'>, bvhPositionBuffer: TSLStorageNode<'vec3'>, bvhNodeBuffer: TSLStorageNode<'float'>): PointsBVHClosestPointWithDirectionFunction;